Study On The Segmented Structure Of The Subway Tunnel Crossing The Ground Fissure Of Xi'an

Ground fissure, as the major geological disaster of xi'an, has coursed serious trouble to the construction and the development of the city. For a long time, people has systematic researched on the causes, distribution and the activity patterns of xi'an ground fissure, but the research on the action model between the ground fissure and structure, the method of manage in engineering, and the calculate method ,the finite element simulation was relatively small.Based on the character of conformation, the cause, and the distribution, the activity patterns of xi'an ground fissure, this article brought forward the subsection structure method when tunnel through the ground fissure, and then, predigested the action model of the structure as a elastic foundation-beam. Adopt different length tunnel structure to calculate by the method of load structural process, gained the stress and strain distribution, and provided the essential data for the tunnel design in portrait.Using the finite element method theory, establishing a 3-D finite element model, and choosing a expanded section structure, this article particularly analyzed the deformation, internal force and the destroy model of the tunnel which get through the ground fissure, and detailed analyzed the position of the formation sew, gained some meaningful results.Based on the interaction between the ground fissure and the tunnel structure, this article advanced the structure measure to deal with the tunnel getting through the ground fissure, optimized the design to minimize the disaster of the tunnel structure, and provided the theoretical help on the designing, constructing, and the maintenance of the underground of xi'an, and cumulated some experience about pipelines, roads etc lifelines structure get through the ground fissure.